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    <title>Document</title>
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<body>
    <script>
        // 1.遍历数组，直接遍历
        let arr = ['红烧茄子', '葱爆牛肉', 44, true];
        console.log(arr[0]);
        console.log(arr[1]);
        console.log(arr[2]);
        console.log(arr[3]);

        console.log(arr);
        console.log('数组的长度为：' + arr.length);

        // 2.for 循环，遍历索引号
        for (let i = 0; i < 4; i++) {
            // console.log(i);
            console.log(arr[i]);
        }

        // 3.数组的长度作为计时器
        for (let i = arr.length - 1; i >= 0; i--) {
            let sum = '';
            for (let j = 0; j <= i; j++) {
                sum = arr[i] + '  ' + sum;
            }
            console.log(sum);
        }
    </script>
</body>

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